wavespectra.construct.frequency.jonswap#

wavespectra.construct.frequency.jonswap(freq, fp, alpha=0.0081, gamma=3.3, sigma_a=0.07, sigma_b=0.09, hs=None, **kwargs)[source]#

Jonswap frequency spectrum for developing seas (Hasselmann et al., 1973).

Parameters:

freq (-) – Frequency array (Hz).
fp (-) – Peak wave frequency (Hz).
alpha (-) – Phillip’s fetch-dependent scaling coefficient.
gamma (-) – Peak enhancement parameter.
sigma_a (-) – width of the peak enhancement parameter for f <= fp.
sigma_b (-) – width of the peak enhancement parameter for f > fp.
hs (-) – Significant wave height (m), if provided the Jonswap spectra are scaled so that \(4\sqrt{m_0} = hs\).

Returns:

Jonswap spectrum E(f) (m2s).

Return type:

Note

If hs is provided than the scaling parameter alpha becomes irrelevant.
If two or more input args other than freq are DataArrays, they must share the same coordinates.